The potential of cooperative MIMO in a tactical radio system in the VHF or UHF band is investigated in this report. By allowing devices to cooperate MIMO gains can be achieved even for devices with a single antenna. In particular, techniques that can provide an increased range for the communication system are of interest. The report describes various techniques for cooperative MIMO, especially beamforming and diversity. To analyze the different techniques, two different scenarios have been used. A fixed scenario consisting of a headquarter that want to communicate with a mobile unit at a great distance and a mobile scenario consisting of a tactical ad hoc network. For the two scenarios, the use of cooperative techniques is described, together with possibilities and limitations. All investigated techniques can yield an improved range for a communication system. However, the techniques require changes in both hardware and software. For a new system, cooperative diversity is an interesting technique, since it can give increased range on individual links as well as higher efficiency in military networks for tactical communications.